title: MR imaging of absorbed dose distributions for radiotherapy using ferrous sulphate gels.
abstract: The measurement of absorbed dose distributions using dosemeter gel and magnetic resonance imaging (MRI) in a standard geometry has been investigated. Absorbed depth-dose curves and profiles measured with this new technique show good agreement with corresponding measurements using diodes. This was proven in a 60Co beam as well as an electron beam. The dosemeter gel is made of agarose and ferrous sulphate solution. The dose response is linear (r = 0.9996) in the investigated dose interval, 0-40 Gy. The sensitivity is a factor of about six higher compared to ordinary ferrous sulphate solution, known as 'Fricke'. This is a true 3D dose measurement technique which will have a number of applications in radiation therapy, since it is possible to mould the gel to arbitrary geometries, mix different radiation qualities and integrate the absorbed dose from different kinds of fields.
authors.affiliation: Department of Radiation Physics, University of Lund, Malmö University Hospital, Sweden.
authors.forename: L E
authors.initials: LE
authors.lastname: Olsson
authors.forename: A
authors.initials: A
authors.lastname: Fransson
authors.forename: A
authors.initials: A
authors.lastname: Ericsson
authors.forename: S
authors.initials: S
authors.lastname: Mattsson
mesh_terms: D004307:Dose-Response Relationship, Radiation; D005296:Ferrous Compounds / Q000528:radiation effects; D005782:Gels; D006801:Humans; D008279:Magnetic Resonance Imaging; D008961:Models, Structural; D011874:Radiometry / Q000379:methods*; D012680:Sensitivity and Specificity; D012685:Sepharose / Q000528:radiation effects
chemical_list: D005296:Ferrous Compounds; D005782:Gels; C020748:ferrous sulfate; D012685:Sepharose